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The highest interest rate in the aggregated short-term debt instruments.

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The lowest interest rate in the aggregated short-term debt instruments.

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Description of the interest rate as being fixed, variable, stepped, etc.

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The percentage of available-for-sale securities having maturity dates during or subsequent to the fourth fiscal year after the date of the most recent fiscal year-end, calculated based on the fair value of the securities.

+ References

No definition available.

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The percentage of available-for-sale securities having maturity dates within one fiscal year from the date of the most recent fiscal year-end, calculated based on the fair value of the securities.

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No definition available.

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The percentage of available-for-sale securities having maturity dates within the third fiscal year after the date of the most recent fiscal year-end, calculated based on the fair value of the securities.

+ References

No definition available.

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The percentage of available-for-sale securities having maturity dates within the second fiscal year after the date of the most recent fiscal year-end, calculated based on the fair value of the securities.

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No definition available.

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The face amount of the securities; generally not indicative of the fair market value.

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No definition available.

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The estimated reduction in the fair value of an investment as a result of a one hundred basis point increase in the discount rate used to calculate the investment's fair value.

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No definition available.

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The estimated reduction in the fair value of an investment as a result of a one year increase in the investment's recovery period.

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No definition available.

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The percent of par value by class for available for sale securities.

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No definition available.

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This item represents the cost of debt and equity securities, which are categorized neither as held-to-maturity nor trading, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any.

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This item represents the gross unrealized losses for securities, at a point in time, which are categorized neither as held-to-maturity nor trading securities.

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No definition available.

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Sales that have taken place during the period in relation to assets measured at fair value and categorized within Level 3 of the fair value hierarchy.

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The amount by which the fair value of an investment is less than the amortized cost basis or carrying amount of that investment at the balance sheet date and the decline in fair value is deemed to be other than temporary, before considering whether or not such amount is recognized in earnings or other comprehensive income.

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Before tax and reclassification adjustments amount of unrealized holding gain (loss) and transfers on available-for-sale securities.

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The cash inflow associated with the sale of debt and equity securities classified as available-for-sale securities.

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Fair Value Narrative (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Feb. 22, 2013	Feb. 24, 2012	Feb. 25, 2011
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Unrealized gain (loss) on investments	$ 2.5	$ (0.7)	$ 3.2
Managed Investment Portfolio and Other Investments [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available-for-sale Securities, Amortized Cost Basis	99.9	79.1
Available-for-sale Securities, Gross Unrealized Losses	0.2	0.4
Available-for-Sale Securities, Maturities [Abstract]
Available-for-sale Securities, Maturities within One Year, Fair Value	40.00%
Available-for-sale Securities, Maturities within Two Years, Fair Value	27.00%
Available-for-sale Securities, Maturities within Three Years, Fair Value	16.00%
Available-for-sale Securities, Maturities within Four or More Years, Fair Value	17.00%
Auction Rate Securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Other than Temporary Impairment Losses, Investments	2.5
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales	0
Available-for-sale Securities, Par Value	11.7
Proceeds from Sale of Available-for-sale Securities	5.0		9.8
Unrealized gain (loss) on investments	0.6
Investment Interest Rate Range [Abstract]
Investment Interest Rate Type	30-day LIBOR
Investment Interest Rate Range Start	2.00%
Investment Interest Rate Range End	2.50%
Available-for-Sale Securities, Maturities [Abstract]
Estimated Reduction in Fair Value due to a One Year Increase in Recovery Period	0.1
Estimated Reduction in Fair Value due to a One Hundred Basis Point Increase in Discount Rate	0.5
CanadianAssetBackedCommercialPaperRestructuringNotes [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Other than Temporary Impairment Losses, Investments	0.9
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales	0.5
Available-for-sale Securities, Par Value	$ 4.4
Investment Interest Rate Range [Abstract]
Investment Interest Rate Type	Canadian Bankers Acceptance Rate less 50 basis points
Investment Interest Rate Range Start	0.50%
Investment Interest Rate Range End	0.50%
CanadianAssetBackedCommercialPaperRestructuringNotes [Member] \| Class A-1 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Percent of Par Value by Class for Available For Sale Securities	75.00%
CanadianAssetBackedCommercialPaperRestructuringNotes [Member] \| Class A-2 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Percent of Par Value by Class for Available For Sale Securities	0.00%
CanadianAssetBackedCommercialPaperRestructuringNotes [Member] \| Class B, Class C and Tracking Notes [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Percent of Par Value by Class for Available For Sale Securities	0.00%